It doesn't matter what profit rate Tether or any other Ponzi scheme claims to provide. In the case of Tether, they're claiming you'll have a profit rate of 0%,

It doesn't matter what profit rate Tether or any other Ponzi scheme claims to provide. In the case of Tether, they're claiming you'll have a profit rate of 0%, which is still worse than you should be getting, given that it may in fact be not backed by anything in particular